General Awareness · Science General

Inventors and Scientific Discoveries

4,616 Questions

This hub provides questions related to great inventors and their scientific discoveries. It covers the inventors of the telephone, radio, and microchips, alongside Nobel Prize winners. These facts are crucial for the general awareness section of major competitive exams.

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Inventors and Scientific Discoveries Questions

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The discovery of auxin is traced back to the work of Charles and Francis Darwin on

  1. Photonastic movement

  2. Photoperiodism

  3. Phototropism

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The work of Charles and Francis Darwin regarding phototropism led to trace back the discovery of Auxin. Tropisms represent the movement in the plant parts which are directed or stimulated by specific stimuli. Plants show phototropism in response to light stimulus. Auxin plays a vital role in exhibiting phototropism in plants.

Multiple choice history the gupta: empire gupta period the vardhans kannauj: age of harshavardhana

'Zero' is believed to have been invented by _______.

  1. Aryabhata

  2. Varahamihira

  3. Bhaskara

  4. Charaka
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

'Zero' is believed to have been invented by Aryabhata. Aryabhatta, one of the world’s greatest mathematician-astronomer, was born in Patliputra in Magadha, modern Patna in Bihar. He wrote his famous treatise the "Aryabhatta-Siddhanta".

Multiple choice history modern age in europe: the renaissance renaissance renaissance europe in transition india's contemporary economic condition reformation and enlightenment in europe reformation in europe

_______ wrote ''Seven Books on the Structure of the Human Body''.

  1. Andreas Vesalius

  2. Gilbert

  3. Francis Willis

  4. Peter Lowe
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Seven books of the Structure of the Human Body was written by Andreas Vesalius. The book was published in 1543. It was a collection of speeches by Vesalius in Padua. This book is an advance description of human anatomy.  

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit
The figures of cork cells as seen by Robert Hooke were published in the book.

  1. Origin of species

  2. Species plantarum

  3. Genera plantarum

  4. Micrographia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In 1665 Robert Hooke published his book Micrographia which detailed his observations and included drawings. This book was the first important work on microscopy, the study of objects through a microscope. At the end of the book, there are observations of the stars and moon as seen through a telescope.

So, the correct answer is " Micrographia ".

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit
Unicellular microscopic organisms were first studied by _____________.

  1. Robert Hooke

  2. Priestley

  3. Pasteur

  4. Leeuwenhoek
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Leeuwenhoek, a Dutch naturalist was the first to observe and describe various unicellular microorganisms like bacteria, protozoa etc. along with animal cells like RBCs, muscles fibres, through a specialized lens designed by him.

So, the correct answer is 'Leeuwenhoek'

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The figures of cork cells as seen by Robert Hooke were published in the book

  1. Origin of species

  2. Species plantarum

  3. Genera plantarum

  4. Micrographia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The  cork cells seen by Robert Hooke were published in his book  'Micrographia'. It was published in January 1665. It was the first book which illustrate the microscopic view of plants and insects. 
  • Origin of species is a work of scientific literature by Charles Darwin . It was published on 24 November 1859.
  • Species Plantarum list every species of plant known at that time. This is a book by Carl Linnaeus , originally published in 1753. 
  • Genera Plantarum is a fifth edition of book Species Plantarum .
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Omnis cellulae cellualae i.e., new cells arise from pre-existing cells; this statement was given by ______.

  1. Schleiden and Schwann

  2. Rudolf Virchow

  3. Robert Brown

  4. Robert Hooke
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rudolf Virchow modified the cell theory of gave the concept of 'omnis cellule e cellulae'- means new cells develop by division of the pre-existing cells. This is called theory of cell lineage or common ancestry.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The term mitosis was given by

  1. Farmer

  2. Flemming

  3. Boveri

  4. Moore
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mitosis was first observed by Boveri and Flemming (1879) in animal cells. But the term mitosis was given by Flemming (1882).

Mitosis is the common method of cell division in which parent cell divides into two daughter cells with an equal number of chromosomes and thus, called as equational division. It occurs in somatic cells of the both unicellular and multicellular organisms.
Therefore, the correct answer is option B.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Who first saw and described a live cell?

  1. Robert Hooke

  2. Robert Brown

  3. Gregor Mendel

  4. Anton von Leeuwenhoek
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The first man to witness a live cell under a microscope was Antonie van Leeuwenhoek, who described the algae, Spirogyra, in 1674. He named that cell as animalcules. He is also known as father of microbiology, as he was first to study the microorganism.
So, the correct answer is option D.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The scientist who first observed bacteria and protozoa is

  1. Antonie Van Leeuwenhoek

  2. Robert Hooke

  3. Mathias Jacob

  4. Robert Brown
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Antonie van Leeuwenhoek (1632-1723) described cells in a drop of pond water using a microscope made by him. He was the first person to observe bacteria and protozoa. By observing the movement of bacteria or protozoa he named them animalcules. Therefore, the correct answer is option A.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

What made the study of cells possible?

  1. Discovery of microorganism

  2. Division of offsprings

  3. Evolution of generation

  4. Invention of microscope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The size of cells and microorganisms are too small to observe by naked eyes. It was impossible to study them but with the invention of the microscope, cells became visible and many new discoveries were made about them. Therefore, the correct answer is option D.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following is not correct?

  1. Robert Brown discovered the cell.

  2. Schleiden and Schwann formulated the cell theory.

  3. Virchow explained that the cells are formed from pre-existing cells.

  4. A unicellular organism carries out its activities within a single cell.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Robert Brown discovered the nucleus. He discovered the presence of nucleus in the cells of orchid root. Nucleus is a specialized double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism. 

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The 'cell doctrine' was given by____________.

  1. Robert Hooke

  2. Schwann, Schleiden and Virchow

  3. Dutrochet

  4. Huxley
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cell theory was proposed by a German botanist, Matthias Schleiden and English zoologist, Theodor Schwann in the year 1839. Cell theory was considered as the most acceptable theory which, elucidated the functioning of a cell. The cell theory includes the following points -
1) All living things are made up of cells.
2) The cell is the smallest living thing that can perform all the functions of life.   
Later on, in the year 1855, Rudolf Virchow added a new point in cell theory that all cells must come from pre-existing cells, which was also known as "Omnis cellula e cellula". The modern cell theory is called as 'Cell Principle' or 'Cell Doctrine'.
So, the correct answer is option B.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Who reported that entity of an organism is not because of the cell but collection of many cells?  

  1. Dutrochet

  2. Dujardin

  3. Robert Brown

  4. Schleiden and Schwann
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Leeuwenhoek was the first to see 'free-living cells' under his microscope. In 1809, Lamarck concluded that all living beings are formed of cells. Living substance was first observed by Corti in 1772 and was named sarcode by Dujardin in 1835. Dutrochet believed in the individuality of cells, i.e., living organisms are made up of a number of individual cells. The nucleus was discovered by Robert Brown and Schleiden and Schwann are credited with the formulation of the cell theory. Thus, the correct answer is option A.